2022
DOI: 10.1088/2058-8585/ac8f58
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Highly sensitive and fully printable humidity sensor on a flexible substrate based on a zinc oxide and polyethylenimine composite

Abstract: We report a highly sensitive and fully printable capacitive humidity sensor based on a zinc oxide (ZnO) and polyethylenimine (PEI) composite. The sensor has a simple structure, consisting only of a layer of the ZnO:PEI composite, coated using an ethanol solution, on a layer of silver inter-digital electrodes (IDEs) that have been pre-printed on a polyethyleneterephthalate (PET) substrate. The sensor with ZnO:PEI in the ratio of 2:1 by volume exhibits a response of 43,907,000% at maximum humidity, with a detect… Show more

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